[Patch] BaseTools: Fix the bug to handle the read-only RAW file

[Yonghong Zhu <yonghong.zhu@intel.com>]

current we use 'r+b' to open the RAW file, it report failure for the
read-only files. so this patch change it to use 'rb' to open the file
since we only read it and no need to write.

Cc: Liming Gao <liming.gao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Yonghong Zhu <yonghong.zhu@intel.com>
---
 BaseTools/Source/Python/GenFds/FfsFileStatement.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/BaseTools/Source/Python/GenFds/FfsFileStatement.py b/BaseTools/Source/Python/GenFds/FfsFileStatement.py
index 690826b..f76ddf4 100644
--- a/BaseTools/Source/Python/GenFds/FfsFileStatement.py
+++ b/BaseTools/Source/Python/GenFds/FfsFileStatement.py
@@ -99,11 +99,11 @@ class FileStatement (FileStatementClassObject) :
                     FileContent = ''
                     MaxAlignIndex = 0
                     MaxAlignValue = 1
                     for Index, File in enumerate(self.FileName):
                         try:
-                            f = open(File, 'r+b')
+                            f = open(File, 'rb')
                         except:
                             GenFdsGlobalVariable.ErrorLogger("Error opening RAW file %s." % (File))
                         Content = f.read()
                         f.close()
                         AlignValue = 1
-- 
2.6.1.windows.1